bkyce scott



(No Model.) 3

D. B. SCOTT.

'BSGAPEMENT FOR PRINTING TELEGRAPHS.

No. 303,327. Patent ed A 12, 1334.

WZT-NESSES INVENTOR Ji l 721 6 ll/077m JQOQMW M W N. PETERS, PIwm-Ldhngmpher. Wnlvmgmn. D, c

Djiryce 5001f,

.U ITE STATES PATENT OFFICE.

'1). nnvon sco'r'r, or BROOKLYN, new- 'ronn.

ESCAPE MENT FOR PRlNTlNG-TELEGRAPHS.

SPECIFICATION forming part of Letters Patent No. 303,327, dated August 12, 1884.

Application filed January 25, 188-1.

To all whom it may concern:

Be it known that I, D. BR CE SCOTT, residing in the city of Brooklyn, county of Kings, and State of New York, a citizen of Canada,

' North America, have made a new and useful improvement relating to electromagnetic escapemcnt apparatus-for controlling the rotation of type-wheels of printing-telegraph instruments, of which the following is a specifi- 1'o cation.

In escapement devices ordinarily employed for the rotation of type-wheels their release and step-by-step rotation are eifected by a toand-fro movement of the escapement-yoke p through the agency of electro-magnets in a main line.

The object of my invention is to provide an escapement apparatus in which the to-and-fro movement of the escapement-yoke is effected,

" not by the escapement elcetro-magnets alone,

but by the combined action of the motor which is usually employed to rotate the escapementwheel when released and the escapement electro-magnets.

- f A further object of my invention is to so construct the pallets of the escapement-yoke that they may, incase the escapement'wheel should happen not to be readily rotated by its motor, have a positive driving capacity to rotate said escapement-wheel step by step. To this end I employ an escape-wheel having what are technically known as reeoihteeth,

, or teeth whose faces form angles with the radial lines drawn from the points of the teeth to the center of motion. In connection with the recoil-teeth upon the eseapement-wheel I employ an escapement-yoke the two pallets of which have double-inclined surfaces so arrangedthat in the rotation of the escapement- 46 wheel any tooth thereon approaching apallet of the escapement-yoke will strike upon the inclined surfaces thereof and tend to drive it to one side. At an obtuse angle with the first inclined surface of a pallet is a second inclined surface, whose position is such that on a reverse movement of the escapement-yoke a second inclined surface will impinge upon the next succeeding tooth of .the escapementwheel, providing in the meantime the escape- 5 ment-wheel has not rotated a portion of astep under the influence of the motor, as it should (No model.)

' have done, and by suchimpingement the pallet will act positively to drive the escapementwheel through thespace of one step of rotation. In the case of a deadbeat escapcment, as dis tiuguished from a rocoil-escapement, the toand-fro movement of the escapement-yoke is comparatively slow, as its inertia and the frietion between its pallets and the teeth of the escapement-whcel must be wholly overcome by the electro-n'ia-guetic influence of the cs-- capement-inagnets, and in that case the force of the motor which tends to rotate the escapenient-wheel increases bearing-pressure and the friction between the pallets of the escapement-yoke and the teeth of the escapementwheel. In my arrangement, however, the recoil-teeth of the escapement-wheel and theinclined surfaces of the pallets of the escape- 1nent-yoke enable the action of the motor of itself to give the eseapcmeut-yoke a rapid toand-fro vibration.

In the operation of printing-telegraph instruments it frequently occurs that after a strip of paper upon which the message is printed has been pressed against the characters of the type-wheel, saidpaper strip will not be quickly withdraw r. f i

.rotatethe :a'frrested I or ore steps hrownig itiou of; tnison.

This defect in operation isvery coi'n'mon where dead-beat .escapements are employed. My device, however, aifords means for positively driving the type-wheel at each to-and-fro rotation of the escapement-pallets whether the action of the motor is or is not sullicient to cause rotation. I first, therefore, give the weight or clock motor a capacity for accelerating the to-and-fro vibrations of the escapemeet-yoke; and, secondly, I give the escapemen't-pallcts a capacity for assisting the clock or weight motor in the operation of rotating the type-wheels.

I will now describe my invention by reference to the accompanying drawings.

N is an escapement-wheel having recoilteeth 1 2 12 13.

T is a type-wheel,whicl.1 is rigidly connected with escapement-wheel N upon shaft D, to

. which a constant tendency to rotation is im- P is a press-magnet controlling an armature-lever, p p, to which is attached a platen for impressing astrip of paper upon the characters upon the periphery of .the typewvheel. Pallet ais provided with two inclided surfaces, a d, and pallet 11 with corresponding inclined surfaces, 1) c. In the normal rotation of the escapement-w11cel, if the escapement-yoke had moved to its extreme left position, the

point of tooth 2 would have passed by the point of pallet 00, and thereupon the point of tooth 12, through the agency of themotor, impelled by weight \V, would be immediately thrown against the inclined surface c'of pal- The impinging of tooth 12 uponvsurface a would conspire with electro-magnets A A to immediately move the escapement-yoke from its extreme left position toward the right, and the escapement-wheel would continueto rotate until the point of tooth 12 had passed the point of pallet 1 Upon the point of 12 passing the point of pallet l the escapementwheel again has a second free movement of rotation under the action of the clock-motor until the point of tooth 1 comes in conta t with the inclined surface (I of pallet 00. However,- if after the escapement-yoke has reached its extren'ie left position, the rotation of the escapement-wheel under theinflucnce of the motor be arrested bya failure to withdraw the paper from the periphery of the type-wheel,

"the reverse movement of the escapement-yoke toward the right will bring the inclined surface a of pallet againstthe point of tooth 2, I a d will 0 v r cglipe 303,327 I x p ment-whcel N until the point of tooth 1 2 is just past the point of pallet 1 If the type wheel again fail to rotate under theaction of the motor, the reverse movement of the eseapement-pallets to the left will bring-the in-' clined surface of dto bear upon the point of positively driven another step, andso on.

The type-wheel is held during an impression tor for driving the same, and inclined sur-- faces upon the escapement-pallets, substantially as described, for aiding said motor to rotate the escapement-wheel.

3. The combination of a type-wheel, an escapement wheel having recoil teeth, and a motor for driving the same, an escapementyoke having pallets provided with inclined surfaces, substantially as described, for enabling the motor which drives said eseapementwheel to accelerate the vibrations of the escapement-yoke, and electro-magnets for controlling said vibration.

4. The combination of an escapement-wheel and a motor for rotating the same, an escapement-yoke controlled by electromagnetism, said yoke being provided with pallets having inclined surfaces, substantially as described, forpositively aiding the motor to rotate said escap omen t-wh eel.

D. BRYCE SCOTT.

Witnesses:

W'M. B. VANsIzE, WM. ARNOUX.

5 a tooth 12, and the escapement-Wheel will be 

